Novel soluble fluorinated poly(ether imide)s with different pendant groups: Synthesis, thermal, dielectric, and optical properties
作者:Yu Liu、Yan Xing、Yunhe Zhang、Shaowei Guan、Haibo Zhang、Yu Wang、Yongpeng Wang、Zhenhua Jiang
DOI:10.1002/pola.24111
日期:——
types of new bis(ether dianhydride) monomers, [4,4′‐(2‐(3′‐methylphenyl)‐1,4‐phenylenedioxy)‐diphthalic anhydride (4a)], [4,4′‐(2‐(3′‐trifluoromethylphenyl)‐1,4‐phenylenedioxy)‐diphthalic anhydride (4b)], and [4,4′‐(2‐(3′,5′‐ditrifluoromethylphenyl)‐1,4‐phenylenedioxy)‐diphthalic anhydride (4c)] were prepared via a multistep reaction sequence. Three series of soluble poly(ether imide)s (PEIs) were prepared
三种新型的双(醚二酐)单体,[4,4'-(2-(3'-甲基苯基)-1,4-苯二氧基)-二邻苯二甲酸酐(4a)],[4,4'-(2- (3'-三氟甲基苯基)-1,4-苯二氧基)-二邻苯二甲酸酐(4b)]和[4,4'-(2-(3',5'-二三氟甲基苯基)-1,4-苯二甲氧基)-二邻苯二甲酸酐(4c)]是通过多步反应序列制备的。通过两步化学酰亚胺化法,从获得的二酐中制备出三系列可溶性聚醚酰亚胺(PEIs)。实验结果表明,所有PEI在氮气下的玻璃化转变温度在200–230°C范围内,失重5%的温度在520–590°C范围内。由于引入了庞大的侧基,PEI在各种有机溶剂中显示出极好的溶解性,并且能够形成坚韧的膜。PEI的流延膜(厚度为80-91μm)具有88至117 MPa的拉伸强度,2.14至2.47 GPa的拉伸模量和15%至27%的断裂伸长率。流延膜在357-377 nm处显示UV-Vis吸收边缘,介电常数低至2